"How is its "presentation" compared to the classic F? Is it more like the Walsh 5 class with a more powerful low end? Or does it up the ante throughout the frequency range for resolution (especially) as well as for dynamic range?"
Rx, my understanding is that current X000 series in general does that relative to the originals of which Walsh 5 (series 1) was the largest. Having owned original Walsh 2s for years prior to obtaining my two newer pair based on last generation series 3 drivers, I can vouch that this was accomplished with series 3. Newer series 4/X000 series is advertised to take things somewhat further, "evolutionary but not revolutionary".
F5015 then appears to be mostly about adding the powered subs onboard to base level 5000 driver in refurbed OHM F cabinets. That obviously has mostly to do with bass levels, especially in larger rooms.
Rx, my understanding is that current X000 series in general does that relative to the originals of which Walsh 5 (series 1) was the largest. Having owned original Walsh 2s for years prior to obtaining my two newer pair based on last generation series 3 drivers, I can vouch that this was accomplished with series 3. Newer series 4/X000 series is advertised to take things somewhat further, "evolutionary but not revolutionary".
F5015 then appears to be mostly about adding the powered subs onboard to base level 5000 driver in refurbed OHM F cabinets. That obviously has mostly to do with bass levels, especially in larger rooms.